Effects of cutting height and mineral and biological fertilizer resources on yield and rationing parameters of rice (cv. Tarom Hashemi)

Provision of nutrients for crops such as rice has a significant role in achieving optimal yield. Therefore, the aim of this study was to maximize the rice plant potential by optimizing the use of mineral and biological fertilizers along with cutting height of ratoon of rice. The experiment was carried out split factorial based on a randomized complete blocks design with three replications at the Rice Research Institute of Iran (Amol) during the growing season of 2014 and 2015. Three levels of harvesting height including 0, 15 cm and 30 cm from the ground as the main plots and phosphorous fertilizers (triple superphosphate) and potassium (potassium sulfate) in two levels (0 and 50 kg ha-1) were first sub-plots and foliar application of Azospirillium brazilennes and Pseudomonas fluorescens were in two levels (foliar application and non-foliar application) as the second sub-plots. The results demonstrated that the highest grain yield was obtained in treatment of 50 kg of phosphorus fertilizer with a harvest height of 30 cm from the ground with an average of 2017.8 kg ha-1. All mineral and biological fertilizers significantly increased plant height, number of tillers per hill and filled spikelet percentage per panicle. In addition, the use of biofertilizers along with phosphorus and potassium fertilizers resulted in increased yield and yield components. Therefore, the application of the above fertilizers can be a suitable alternative for high consumption of nitrogen in the production of rice rice in the region.